* {{cite book | last=Kaku | first=Michio | title=Quantum Field Theory | publisher=Oxford University Press, USA | publication-place=New York | date=1993 | isbn=0-19-509158-2}}
<ref name="n075">{{cite book | last=Kaku | first=Michio | title=Quantum Field Theory | publisher=Oxford University Press, USA | publication-place=New York | date=1993 | isbn=0-19-509158-2 | page=}}</ref>